The Path of a letter in Framley Parsonage

[In chapter 5 of Framley Parsonage Trollope draws upon his knowledge of the British postal system to explain how an important letter made its way to its addressee, a Sabbatarian who refused to accept mail on Sundays. This passage allowed Trollope to do three things: show off, create ethos (or credibility) by displaying interesting knowledge of how something works, and also to fill out the required verbiage for a novel that would eventually see publication in parts (and only later in volume form). Emphasis added.
— George P. Landow]

And now, with my reader's consent, I will follow the postman with
that letter to Framley; not by its own circuitous route indeed, or by
the same mode of conveyance; for that letter went into Barchester by
the Courcy night mail-cart, which, on its road, passes through the
villages of Uffley and Chaldicotes, reaching Barchester in time for
the up mail-train to London. By that train, the letter was sent
towards the metropolis as far as the junction of the Barset branch
line, but there it was turned in its course, and came down again by
the main line as far as Silverbridge; at which place, between six and
seven in the morning, it was shouldered by the Framley footpost
messenger, and in due course delivered at the Framley Parsonage
exactly as Mrs. Robarts had finished reading prayers to the four
servants. Or, I should say rather, that such would in its usual
course have been that letter's destiny. As it was, however, it
reached Silverbridge on Sunday, and lay there till the Monday, as the
Framley people have declined their Sunday post. And then again, when
the letter was delivered at the parsonage, on that wet Monday
morning, Mrs. Robarts was not at home. As we are all aware, she was
staying with her ladyship at Framley Court.